* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 115 expected. For the Heat Advisory, heat index values up to 110 expected. * WHERE. In Arkansas, Crawford, Franklin, and Sebastian Counties. In Oklahoma, Muskogee, Sequoyah, Mayes, Okmulgee, Rogers, Tulsa, Wagoner, Haskell, Le Flore, and McIntosh Counties. * WHEN. For the Excessive Heat Warning, until 9 PM CDT this evening. For the Heat Advisory, from noon to 9 PM CDT Thursday. * IMPACTS. The combination of hot temperatures and high humidity will create a dangerous situation in which heat related illnesses are more likely.

* WHAT. Heat index values up to 108 expected both today and Thursday. * WHERE. In Arkansas, Benton, Carroll, Madison, and Washington Counties. In Oklahoma, Cherokee, Okfuskee, Adair, Craig, Creek, Delaware, Nowata, Osage, Ottawa, Pawnee, and Washington Counties. * WHEN. For the first Heat Advisory, until 9 PM CDT this evening. For the second Heat Advisory, from noon to 9 PM CDT Thursday. * IMPACTS. Heat related illnesses are possible especially impacting those not acclimated to the conditions or those performing strenuous activities.

* WHAT. Heat index values up to 110 degrees expected. * WHERE. Kingfisher, Logan, Payne, Noble, and Washita Counties. * WHEN. From noon to 9 PM CDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 110 degrees expected. * WHERE. Portions of central, east central, southeast, southern, and southwest Oklahoma and northern Texas. * WHEN. For the first Heat Advisory, from noon today to 9 PM CDT this evening. For the second Heat Advisory, from noon to 9 PM CDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.